Very expensive to replace the fuel pumps, especially if there are two of them as found on my TE. Try the relay first. I tell you this from experience. Tip: If you do change the pump and it turns out not to be the problem, sell the used one on ebay. There is a definite market out there.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles